Threaded Test Probes & Sockets / Receptacles If you need further information please contact us at this email address, or download the Equip-Test Catalog. TT500 – Centers 50Mil / 1.27 mm – Threaded Probes TT501 – Centers 50mil / 1.27mm – Threaded Probes TT502 – Centers 50mil / 1.27mm – Threaded Probes RCT039 – Centers 50mil / 1.27mm – Threaded Probes TT750 – Centers 75mil / 1.91mm – Threaded Probes TT751 – Centers 75mil / 1.91mm – Threaded Probes RCT049 – Centers 75mil / 1.91mm – Threaded Probes TT1000 – Centers 100mil / 2.54mm – Threaded Probes TT1001 – Centers 100mil / 2.54mm – Threaded Probes TT1003 – Centers 100mil / 2.54mm – Threaded Probes TT1005 – Centers 100mil / 2.54mm – Threaded Probes TT1006 – Centers 100mil / 2.54mm – Threaded Probes TT1007 – Centers 100mil / 2.54mm – Threaded Probes TT1008 – Centers 100mil / 2.54mm – Threaded Probes TT1009 – Centers 100mil / 2.54mm – Threaded Probes RCT079 – Centers 100mil / 2.54mm – Threaded Probes TT1600 – Centers 120mil / 3.00mm – Threaded Probes RCT118 – Centers 120mil / 3.00mm – Threaded Probes TT1603 – Centers 160mil / 4.00mm – Threaded Probes TT1605 – Centers 160mil / 4.00mm – Threaded Probes TT1606 – Centers 160mil / 4.00mm – Threaded Probes TT1770 – Centers 177mil / 4.50mm – Threaded Probes TT1771 – Centers 177mil / 4.50mm – Threaded Probes TT1772 – Centers 160mil / 4.00mm – Threaded Probes TT2000 – Centers 200mil / 5.08mm – Threaded Probes